The never-ending quest for starting pitching depth has taken the Phillies to Carlos Zambrano, the controversial righthander long known for his histrionics. Zambrano signed a minor-league deal Wednesday.

The Phillies felt adding depth was a necessity with Roy Halladay undergoing shoulder surgery Wednesday and no veteran rotation presence at triple-A Lehigh Valley.

Zambrano will report to extended spring training in Clearwater, Fla., next week. The Phillies must promote him to the majors by July 1, or he can ask for his release, assistant general manager Scott Proefrock said.

It could be some time before Zambrano is able to join triple A because he must build arm strength. The 32-year-old pitcher spent time with Venezuela in the World Baseball Classic this spring but did not land a major-league job until now.

Premature reports of Zambrano's signing surfaced last week. He had agreed to terms with the Long Island Ducks of the independent Atlantic League but never signed that deal. Now he is property of the Phillies.

Jonathan Pettibone has sufficed as fifth starter. John Lannan remains sidelined by a knee injury and his return should come sometime in June. Beyond that, Tyler Cloyd impressed in his one start and prospect Adam Morgan has stumbled after a fast start at triple A.

Zambrano has a career 3.66 ERA in 12 seasons. He spent 2012 with Miami and posted a 4.49 ERA in 35 games (20 starts).